/Engine/Source/Runtime/Slate/Public/Framework/Docking/TabManager.h
Register a new normad tab spawner with the tab manager. The spawner will be called when anyone calls InvokeTab(). A nomad tab is a tab that can be placed with major tabs or minor tabs in any tab well
The registration entry for the spawner.
[FTabSpawnerEntry](API\Runtime\Slate\Framework\Docking\FTabSpawnerEntry) & RegisterNomadTabSpawner ( const [FName](API\Runtime\Core\UObject\FName) TabId, const FOnSpawnTab & OnSpawnTab, const FCanSpawnTab & CanSpawnTab )